Diplomacy is the art and practice of conducting negotiations between representatives of states. It usually refers to international diplomacy, the conduct of international relations through the intercession of professional diplomats with regard to a full range of topical issues. International treaties are usually negotiated by diplomats prior to endorsement by national politicians. David Stevenson reports that by 1900 the term "diplomats" also covered diplomatic services, consular services and foreign ministry officials.

It would be some time before I fully realized that the United States sees little need for diplomacy; power is enough. Only the weak rely on diplomacy. This is why the weak are so deeply concerned with the democratic principle of the sovereign equality of states, as a means of providing some small measure of equality for that which is not equal in fact. Coming from a developing country, I was trained extensively in international law and diplomacy and mistakenly assumed that the great powers, especially the United States, also trained their representatives in diplomacy and accepted the value of it. But the Roman Empire had no need for diplomacy. Nor does the United States. Diplomacy is perceived by an imperial power as a waste of time and prestige and a sign of weakness.